Convoluted Leslie? - Linux-audio-user

hollunder＠gmx.at

24 Jan 24 Jan

8:46 a.m.

On Mon, 21 Jan 2008 22:11:52 -0800 Ken Restivo <ken(a)restivo.org> wrote:

Anyone have a Leslie and willing to make a convolution impulse of it (say, using Fons' program for generating impulses)? I love the sound of AZR3, and the Leslie is quite good, the only thing it is missing is the sound of the WOOD, of the actual Leslie cabinet itself. I'm curious what it'd sound like through a clean convolution of just the cabinet, possibly not even using the Leslie tube amp, just a clean transistor amp into the Leslie speakers. Of course the tonewheel shape 2 or 3 setting isn't QUITE a tonewheel, but it's very close. If I could get the Leslie wood cabinet resonance in there I think it'd kick even more ass than it already does. -ken _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user

Hi Ken, I don't own a Leslie but I know where to find quite some of them. I might do some sampling there and could probably do that as well. Problem is that I don't know how to do that, I'd need a lot more information. Best regards, Philipp

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Ken Restivo

25 Jan 25 Jan

10:09 p.m.

On Thu, Jan 24, 2008 at 02:14:13PM +0100, Fons Adriaensen wrote:

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On Thu, Jan 24, 2008 at 01:46:00PM +0100, hollunder(a)gmx.at wrote:

On Mon, 21 Jan 2008 22:11:52 -0800 Ken Restivo <ken(a)restivo.org> wrote:

Anyone have a Leslie and willing to make a convolution impulse of it (say, using Fons' program for generating impulses)? I love the sound of AZR3, and the Leslie is quite good, the only thing it is missing is the sound of the WOOD, of the actual Leslie cabinet itself. I'm curious what it'd sound like through a clean convolution of just the cabinet, possibly not even using the Leslie tube amp, just a clean transistor amp into the Leslie speakers. Of course the tonewheel shape 2 or 3 setting isn't QUITE a tonewheel, but it's very close. If I could get the Leslie wood cabinet resonance in there I think it'd kick even more ass than it already does. -ken _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user

Hi Ken, I don't own a Leslie but I know where to find quite some of them. I might do some sampling there and could probably do that as well. Problem is that I don't know how to do that, I'd need a lot more information.

I guess that the FR of the cabinet will not be constant but depend on the 'phase' of the Leslie effect, i.e. the position of the rotor. In other words, it's not only a delay modulation but also a 'filtering' modulation. One way to get a 'near to perfect' Leslie sound and effect at the same time would be to measure the IR at say 30 positions of the rotor, then use 30 convolutions and both shift and xfade them in the correct sequence and frequency. Probably not easy but it can be done. If the Leslie effect is already done in softwared, you'd need some 'average' IR of the cabinet to add 'the wood'. Just drop me a line if you need help in using Aliki to capture the IR(s).

That's exactly what I want. Wood (huh-huh. he said... wood). I'm very happy with the Leslie sim in AZR3. Only thing that sounds missing to me is the resonance of the wood cabinet. -ken

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philicorda

12:27 p.m.

On Fri, 2008-01-25 at 22:23 -0700, thomas fisher wrote:

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On Friday 25 January 2008 19:08:11 Ken Restivo wrote:

<snip>

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I'm very happy with the Leslie sim in AZR3. Only thing that sounds missing to me is the resonance of the wood cabinet. -ken

From what I have heard from instrument makers is that there is much more than just "wood" involved. For example fine straight grain spruce is very much sought for. However there is a whole list of grades of spruce. Also certain species of white pine, old growth redwood. About eight years ago in northern California I met this fellow that had been a part of a very small specialty company that cut blanks for instrument tops from salvaged old growth redwood. He had about four or five grades, of which he demonstrated to me by holding the blank a certain way and thumped it. Some of the highest grades rang like Tibetan bell! And I would imagine the list gets much longer when one considers the woods of the world. One retired concert violinist I knew, would take his instruments apart and would shave whispers off here and there. I am a wood worker but I am no authority on this subject and am just sharing the very little that I do know.

On a leslie cabinet there are wooden slats that go across the openings on the sides. These resonate a bit with the percussion and could be audible. If you pluck them with a fingernail they have quite distinct notes. I don't know what wood the cabinet is made of, but I doubt it's anything exotic. Anyway, Ken, I have a leslie here and a mic. It's an old one so I can't patch external audio into unfortunately. I wonder if there is another way to get an IR. Perhaps hitting it with a stick or something. :)

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